Tobit reassured her: "Have no such thought. Our son will leave in good health and come back to us in good health. Your own eyes will see the day when he returns to you safe and sound. So, no such thought; do not worry about them, my love. For a good angel will go with him, his journey will be successful, and he will return unharmed." (Tobit 5: 21-22)

We know the good angel is standing there. Tobit does not know this.

We know that God has heard Tobit's prayer and is already acting to heal his blindness and despair. Tobit only asked for death.

What Tobit tells his wife is true. But he cannot know it.

Tobit speaks with confidence regarding God's intention. But God's intention goes far beyond his comprehension.

As Tobit's own life demonstrates, risk is real. Ultimately we can be sure of God's love. All else is beyond certainty.